St John O'Neill (6 May 1741[1][2]–March 1790[2][3]) represented Randalstown in the Irish House of Commons from 1771 to 1776.
[4] He was returned unopposed[5] at a by-election for Randalstown occasioned by the death of his father Charles O'Neill of Shane's Castle.
[3][7] St John O'Neill married a Miss Borrowes and they had one daughter, who died unmarried.
[n 1] He resided at Portglenone Castle, and donated a copper collecting-ladle to the Portglenone chapel of ease of the Church of Ireland parish of Ahoghill,[10] and a church organ to the Catholic chapel near by at Aughnahoy.
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